I've seen a lot of guides and presentations outlining, sometimes in great detail, what it takes to write a good criteria for an invitation document, but who can remember all of that. In reality, you can break it down into three areas of consideration. What do I want supplied; How will I know a supplier has it; How will I assess their responses.
Establishing a detailed and concise set of response criteria not only facilitates the extraction of key information in vendors responses, helping to align their solution with the actual requirements, it also allows easier evaluation and scoring of those responses, but not all criteria has equal importance. This is where applying a method of weighting the criteria provides the ability to define which criterion will have the greatest benefit to delivering the requirement and is therefore more important. But the question is, should the weighting be published as part of the invitation for offer, or should it be for internal information only?